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From "Eric Yang (JIRA)" <>
Subject [jira] Commented: (CHUKWA-313) Remove the 10 sec ack from SeqWriter
Date Thu, 18 Jun 2009 21:38:07 GMT


Eric Yang commented on CHUKWA-313:

+1 on removing flush.

> Remove the 10 sec ack from SeqWriter
> ------------------------------------
>                 Key: CHUKWA-313
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: Improvement
>            Reporter: Jerome Boulon
>            Assignee: Jerome Boulon
> SeqWriter.add is waiting 10 sec in a worse case before calling a flush. This was there
to guarantee that the data has been written to HDFS before returning the ack.
> It used to work well with 0.18 but in 0.20 the flush is a nohup so there's no point in
waiting 10 sec for nothing.
> The real flush will give us the ability to write redo logs directly to HDFS so the ack
implementation will have to change anyway.
> So I vote for removing the 10 sec ack from the add method.

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